NTC thermistors for inrush current limiting
Inrush Current Limiters (ICLs)
Series/Type:
Ordering code:
Date:
Version:
S464/40/M
B57464S 400M
2017-07-31
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Identification/Classification 1
NTC thermistors for inrush current limiting
(header 1 + top left bar):
Identification/Classification 2
Inrush Current Limiters (ICLs)
(header 2 + bottom left header bar):
Ordering code: (top right header bar)
B57464S 400M
Series/Type: (bottom right header bar)
S464/40/M
Preliminary data (optional):
Data sheet
Department:
PPD VAR PD
Date:
2017-07-31
Version:
f
EPCOS AG 2017. Reproduction, publication and dissemination of this publication, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
NTC thermistors for inrush current limiting
Inrush Current Limiters (ICLs)
Data sheet
B57464S 400M
S464/40/M
Application
NTC-thermistor for inrush current limiting in peripheral communication equipment, e.g. in switch-
mode power supplies.
Features
Black coated thermistor disk
Coating material is flame retardant (UL 94 V-0 approved)
Kinked leads of tinned copper wire
Lead spacing 7.5 mm
High stability of electrical characteristic
Terminals solderable in accordance with IEC 60068-2-20, test ta, method 1
ICL support to fulfill the requirements according EN 61000 of power circuits
Usable in series connections up to 265 V
rms
UL approval (E69802)
CQC approval (CQC09001040539)
RoHS-compatible
PPD VAR PD
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 12
2017-07-31
NTC thermistors for inrush current limiting
Inrush Current Limiters (ICLs)
Data sheet
B57464S 400M
S464/40/M
Drawing
b
th
h
LL
LD
LS
27.0 max
7.0 max
31.0 max
25.0 min
1.0 ±0.05
7.5 ±0.8
mm
mm
mm
mm
mm
mm
1) Seating plane to IEC 60717
Approx. weight: 9 g
General technical data
Climatic category
Max. power
B value
B value tolerance
Resistance tolerance
Rated temperature
Dissipation factor
Thermal cooling time constant
Heat capacity
(IEC 60068-1)
(at 25 °C)
55/170/21
6.7
3450
3
20
25
approx. 30
approx. 130
approx. 3900
(in air)
(in air)
P
max
B/B
R
R
/R
R
T
R
th
th
C
th
W
K
%
%
°C
mW/K
s
mJ/K
Electrical specification and ordering codes
R
25
Ω
40
I
max
(0...65 °C)
A
4.4
C
test
at 230 V AC
μF
2500
2)
C
test
at 110 V AC
μF
10000
R
min
(at Imax, 25 °C)
Ω
0.28
Ordering code
B57464S 400M
2) 1200μF at 240V and 4800μF at 120V in UL spec.
PPD VAR PD
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 12
2017-07-31
NTC thermistors for inrush current limiting
Inrush Current Limiters (ICLs)
Data sheet
B57464S 400M
S464/40/M
Maximum continuous current I
max
The I
max
denotes the maximum permissible continuous current (DC or RMS values for sine-shaped AC) in the
temperature range from 0 to 65 °C.
Load derating (I
/ I
max
)
The power handling capability of an NTC thermistor cannot be fully utilized over the entire temperature range.
For circuit dimensioning the derating curve given below provides information on the extent to which the current
must be reduced at a certain ambient temperature (T
A
).
I / I
max
Percent of I
max
1
T
65
C
100
1
A
=
T
max
65
C
T
A
= ambient temperature ( T
A
> 65°C )
T
max
= 170°C
Ta
-25
0
65
170
Fig. 1 Maximum current derating (I / I
max
)
Maximum permissible capacitance
The currents during turn-on are much higher than the rated currents during continuous operation. To test the
effects of these current surges EPCOS uses the following standard procedure according to IEC 60539-1:
Thyristor
switch
R
S
V
load
C
test
R
T
V
NTC
V
load
C
test
R
s
V
NTC
Load voltage [V]
Test capacitance [μF]
Series resistance [Rs = 1
Ω]
Voltage drop across the NTC under test [V]
= 180/375 V
(corresponds (110/230 V + dV) x 1.41)
`
TNT0358-L-E
Fig. 2 Maximum switchable capacity measuring circuit
Marking
EPCOS – logo
Resistance value
NTC
Date code with 4 digits (year and week of production): 1536 (example for week 36 in year 2015)
2017-07-31
Page 4 of 12
PPD VAR PD
Please read
Cautions and warnings
and
Important notes
at the end of this document.
NTC thermistors for inrush current limiting
Inrush Current Limiters (ICLs)
Data sheet
B57464S 400M
S464/40/M
Reliability data
Test
Standard
IEC
60068-2-2
Test conditions
Storage at upper category
temperature
T: 170°C
t: 1 000 h
Temperature of air: 40°C
Relative humidity of air: 93 %
Duration: 21 days
Lower test temperature: -55 °C
t: 30 min
Upper test temperature: 170 °C
t: 30 min
Time to change from lower to
upper temperature: < 30 s
Number of cycles: 10
Ambient temperature: 25
±5
°C
I = Imax
t: 1000 h
Ambient temperature: 25
±5
°C
Cyclic
endurance
IEC
60539-1
I = Imax
On-time = 1 min
Cooling time = 5 min
Number of cycles: 1000
Ambient temperature: 25
±5
°C
Capacitance = C
test
Number of cycles: 1000
< 20 %
No visible
damage
< 20 %
R
25
/ R
25
(typical)
Remarks
Storage in dry
heat
< 20 %
No visible
damage
Storage in damp
heat, steady
state
IEC
60068-2-78
< 20 %
No visible
damage
Rapid change of
temperature
IEC
60068-2-14
< 20 %
No visible
damage
Endurance with
max. current
IEC
60539-1
No visible
damage
Maximum
permissible
capacitance test
IEC
60539-1
< 20 %
No visible
damage
Note
The self-heating of a thermistor during operation depends on the load applied and the applicable dissipation
factor.
When loaded with maximum allowable current/power and the specified dissipation factor is taken as a basis,
the NTC thermistor may reach a mean temperature of up to 250
C.
The heat developed during operation will also be dissipated through the lead wires. So the contact areas, too,
may become quite hot at maximum load.
When mounting NTC thermistors you have to ensure that there is an adequate distance between the
thermistor and all parts which are sensitive to heat or combustible.
PPD VAR PD
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 12
2017-07-31
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